A sonar image collected last year by The International Group for Historic Aircraft Recovery off a mid-Pacific island in the Republic of Kiribati shows an "anomaly" that might be pieces of the aircraft lying about 600 feet below the surface on an underwater cliff, TIGHAR reports.

The anomaly looks like a line or scar in what otherwise is a fairly smooth area.

TIGHAR concedes that:

"Maybe the anomaly is a coral feature that just happens to give a sonar return unlike any other coral feature on the entire reef slope. Maybe it's a sunken fishing boat that isn't mentioned in any of the historical literature. Maybe it's the boat nobody knows about that that brought the castaway nobody missed who died at the Seven Site."

But, the researchers add, "maybe it's [also] pure coincidence that it's the right size and shape to be the Electra wreckage — the Electra that so much other evidence suggests should be in that location."

Earhart — the first woman to fly solo across the Atlantic Ocean (in 1932) — disappeared in the mid-Pacific in July 1937, when she and navigator Fred Noonan were attempting to fly around the world.

Last year, TIGHAR Executive Director Richard Gillespie and his team went to Nikumaroro Island in the Republic of Kirbati to see whether they could find any evidence of Earhart's plane near the spot where a photo taken in 1937 showed something sticking up from the water. That's when they took the sonar images they've now had time to analyze.